// Set I2C alternative pins
	PORTMUX_CTRLB |= PORTMUX_TWI0_bm;

	TWI0.SADDR = 0x20 << TWI_ADDRMASK_gp /* Slave Address: 0x20 */
	             | 0 << TWI_ADDREN_bp;   /* General Call Recognition Enable: disabled */

	// TWI0.SADDRMASK = 0 << TWI_ADDREN_bp /* Address Mask Enable: disabled */
	//		 | 0x0 << TWI_ADDRMASK_gp; /* Address Mask: 0x0 */

	TWI0.SCTRLA = 1 << TWI_APIEN_bp    /* Address/Stop Interrupt Enable: enabled */
	              | 1 << TWI_DIEN_bp   /* Data Interrupt Enable: enabled */
	              | 1 << TWI_ENABLE_bp /* Enable TWI Slave: enabled */
	              | 1 << TWI_PIEN_bp   /* Stop Interrupt Enable: enabled */
	              | 0 << TWI_PMEN_bp   /* Promiscuous Mode Enable: disabled */
	              | 0 << TWI_SMEN_bp;  /* Smart Mode Enable: disabled */
	TWI0.SCTRLA |= TWI_ENABLE_bm;	   // Enable